The credit card sized sensor (worn on top left arm) is also autonomous, and all communication hardware is internal and includes Bluetooth, NFC, Wi-Fi and its own global cellular modem. If no connectivity is available, local alerting is also available with all data being stored and transmitted when connectivity is restored.
Grip strength measurements are easy to calculate, but they are sensitive enough to detect even the smallest of changes in hand strength, which makes them especially useful when tracking the progress of a patient going through physical therapy.
It's also a reliable indicator of a greater risk of heart attack or stroke. In an international study, researchers found that an 11-pound decrease in grip strength is correlated to a 17 percent increased risk of cardiovascular death, a 7 percent increased risk of heart attack and a 9 percent increased risk of stroke.